Leak detection of outdoor fire pipeline

Before water leakage detection of fire-fighting pipeline, some necessary factors should be mastered, which are divided into 1, water leakage 2, pipeline material 3, pipeline size 4, pipeline buried depth 5 and pipeline direction.

6. Pavement medium conditions, etc.

Leak detection of outdoor fire pipeline

1, boom detection method: This method is the most primitive and direct method, that is, listen to the sound on the ground along the pipeline with boom, or plug the boom into the ground fire hydrant to detect whether there is water leakage.

2. Electronic listening method: this method uses the signal generated by the friction between the water leakage point of the pipeline and the surrounding medium to transmit electronic audio, and amplifies this signal to 300-2500Hz, and obtains accurate audio through the adjustment of the water leakage detection instrument, thus determining the water leakage position.

3. After determining the water leakage position, it is necessary to drill holes above the water leakage position of the pipeline. If water comes out or gas is ejected, it proves that this is the water leakage point.

34 residual chlorine detection method

According to the factory water standard stipulated by the state, the residual chlorine content after contact with water for 30 minutes shall not be lower than 0.3mg/L, and the free residual chlorine content in the water at the end of the pipe network shall not be lower than 0.05.

Mg/liter. Based on the principle that residual chlorine and o-toluidine reflect the formation of yellow quinone, the collected water samples are detected, and whether there is leakage in the water supply network is judged by visual colorimetry.

5. Infrared detection method: Infrared thermal imaging detection can convert signals into patterns that can be distinguished by human eye friction. By infrared scanning the area in the pipe network, a professional topographic map of temperature difference can be generated. When groundwater leaks in a certain place, there will be a temperature difference between the local area and the surrounding area, which is obviously different from other areas. By observing this difference, we can accurately find out the leakage point.

What are the requirements for indoor and outdoor fire hose materials?

1, when the number of indoor fire hydrants is greater than 10 and the indoor fire water consumption is greater than 15L/s, the water inlet pipe of the indoor fire water supply pipe should be connected with the outdoor ring pipe network at least, and the indoor pipe should be connected into a ring or the water inlet pipe and the outdoor pipe should be connected into a ring. When the water inlet pipe of the ring pipe network has an accident; The remaining inlet pipes should still be able to supply all the water.

2. Tower houses with more than six floors, other civil buildings with a mass exceeding 10000m, and factories and warehouses with a mass exceeding four floors. If there are two or more indoor fire-fighting risers, at least every two risers should be connected into an annular pipeline.

3, high-rise industrial building indoor fire riser should be annular, and the diameter of the pipe should not be less than100 mm. ..

4, indoor fire water supply pipeline application valve is divided into several independent sections, when a section is damaged, stop using the fire hydrant in a layer should not be more than five. The arrangement of valves on indoor fire water supply pipes in high-rise buildings should ensure that no more than one riser is closed during pipeline maintenance, and two risers can be closed when there are more than three. The valve should be opened frequently, and there should be obvious signs of opening and closing.

5. When other water reaches the maximum second flow, the indoor pipeline where fire water is mixed with other water should still be able to supply all fire water. The shower water consumption can be calculated as 15% of the calculated water consumption.

6. When the production and domestic water consumption reaches the maximum, and the municipal water supply pipeline can still meet the indoor and outdoor fire water consumption, the water inlet pipe of the indoor fire pump should take water directly from the municipal pipeline.

7, indoor fire hydrant water supply pipe network and automatic sprinkler equipment pipe network, should be set separately; If there is any difficulty, it should be set separately in front of the alarm valve.

8. Indoor fire hydrants in non-heating workshops and warehouses in cold areas can adopt dry system, but a quick opening and closing device should be set on the inlet pipe, and an exhaust valve should be set on the top of the pipe.